Calculated period spectrum for the excited modes for each of the retained models represented by the gray circles in Fig. 1. The color code indicates the logarithm of the e-folding time, τ_e. The blue dotted curve defines the upper limit (radial order n = 1) of the p-mode spectrum, while the red dotted curve corresponds to the lower limit (radial order n = 1) of the g-mode spectrum. The green (magenta) lines denote the three observed mixed-atmosphere pulsators (two WASP pulsators). Left panel: comparison between the basic, diffusion, and diffusion+rotation for roughly the same WD mass; right panel: comparison of different WD masses and metallicities in the rotation+diffusion configuration.